Compare Viagra vs. Cialis

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Viagra
(Sildenafil)

Cialis
(Tadalafil)

Helps you get aroused. Viagra (Sildenafil) is a first-choice treatment for erectile dysfunction. However, you need to take it at least 30 minutes before having sex, so the lack of spontaneity may not work for some people.Helps you get aroused. Cialis (Tadalafil) is the only medication in its class that treats both erectile dysfunction and enlarged prostate symptoms. You can also take it on a regular basis, which can allow for more spontaneity, but it can be expensive.
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Reviews & ratings
Filter group. All currently selected
Filter group. All currently selected
5.12Viagra
Reviews for Viagra (Sildenafil)
67%
of people (All ages) say Viagra (Sildenafil) is worth it
51%
say it works well
16%
say it's a big hassle
843 reviews
Have you used Viagra (Sildenafil)?
Worth itNot sureNot worth it
Reviews for Cialis (Tadalafil)
66%
1% vs. Viagra (Sildenafil)
46%
5% vs. Viagra (Sildenafil)
14%
+2% vs. Viagra (Sildenafil)
606 reviews
Have you used Cialis (Tadalafil)?
Worth itNot sureNot worth it
Side effects
ViagraCialis

The Viagra FDA package insert doesn’t have numbers about how common side effects are.

More about Viagra side effects »
  • Headache 10%
  • Indigestion 9%
  • "stomach flu" 3%
  • Back pain 3%
  • Muscle pain 3%
  • Flushinga 2%
  • Flushing 2%
  • Pain in limb 2%
  • Common cold 1%
More Cialis side effects »
How it works
ViagraCialis
Viagra (Sildenafil) is a PDE-5 inhibitor. Blocking PDE-5 allows blood to enter the penis and helps create an erection.Cialis (Tadalafil) is a PDE-5 inhibitor. Blocking PDE-5 allows blood to enter the penis and helps create an erection. Cialis (Tadalafil) also treats enlarged prostate symptoms.
Type of medication
ViagraCialis
Phosphodiesterase-5 enzyme inhibitorPrescription only
Phosphodiesterase-5 enzyme inhibitorPrescription only
Available as
ViagraCialis
  • Pill
  • Pill
Used for (click to learn more)
ViagraCialis
Risk factors for serious side effects
ViagraCialis
  • Having a heart attack, stroke, or rhythm problem in your heart in the last 6 months
  • Having low or high blood pressure
  • Heart failure or coronary artery disease causing unstable angina (chest pain)
  • Men over 50 years of age
  • Taking alpha blockers
Detailed risks & warnings »
  • Men over 50 years of age
Detailed risks & warnings »
Pregnancy

Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

Alcohol
ViagraCialis
No alcohol related info.
  • Don't drink a lot of alcohol when you're taking this medication since it can make dizziness worse.
Food
ViagraCialis
  • Taking it after eating a high-fat meal can delay or reduce its effects.
  • Can be taken with or without food.
  • Can be taken with or without food.
Sex
ViagraCialis
No sex related info.
  • Taking Cialis (Tadalafil) for erectile dysfunction can put you at increased risk for heart attack or stroke if you've had problems with your heart in the past. Also, it is not recommended for men to take Cialis (Tadalafil) if they've had a heart attack in the past 3 months or a stroke or a diagnosis of moderate to severe heart failure in the past 6 months. Talk to your doctor if you are interested in taking this medication.
Upsides and benefits
ViagraCialis
  • It can be taken just when you need it.
  • First-choice medication for treating erectile dysfunction.
  • It's the only one in its class to also treat enlarged prostate symptoms.
  • Can be taken either as needed, or on a regular basis (which allows you to be more spontaneous before sex).
  • Can be taken with or without food.
  • Lasts longer than Viagra.
  • First-choice medication for treating erectile dysfunction.
Downsides and risks
ViagraCialis
  • You need to take it at least 30 minutes before sex.
  • Taking it after eating a high-fat meal can delay or reduce its effects.
  • Can't be taken if you've had a heart attack in the past 3 months, or stroke or heart failure in the past 6 months.
  • Side effects can be more pronounced if you're over age 65.
  • Can cause flushing, headache, and dizziness, or sudden hearing and vision changes.
  • Can't use if you've recently taken nitrates like Isordil, Imdur, or nitroglycerin (Nitro-BID, Nitro-Dur, Nitrostat).
  • Only available as brand name, so it can be expensive.
  • Can't be taken if you've had a heart attack in the past 3 months, or stroke or heart failure in the past 6 months.
  • Side effects can be more pronounced if you're over age 65.
  • Can cause flushing, headache, and dizziness, or sudden hearing and vision changes.
  • Can't use if you've recently taken nitrates like Isordil, Imdur, or nitroglycerin (Nitro-BID, Nitro-Dur, Nitrostat).
Tips from our pharmacists for people taking the medication
ViagraCialis
  • It's best to take Viagra (Sildenafil) about 1 hour before sexual activity, but you can take it anywhere between 4 hours and 30 minutes before you need it.
  • Don't take it more than once a day.
  • Can cause flushing, a headache, or dizziness.
  • Works best when taken on an empty stomach. Fatty foods can prevent Viagra (Sildenafil) from working as well.
  • If you have an erection for more than 4 hours, go to the ER or call your doctor.
  • Comes in two differents doses: one that's taken on a regular basis and the other only when you need it.
  • If you're taking Cialis (Tadalafil) on a regular basis, take it at the same time every day.
  • Don't take [name_ommon] more than once a day.
  • Can be taken with or without food.
  • Don't drink a lot of alcohol when you're taking this medication since it can make dizziness worse.
  • Can cause flushing, headache, and dizziness.
  • If you have an erection for more than 4 hours, go to the ER or call your doctor.
Learn more
More about ViagraSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Viagra (Sildenafil)?
Worth itNot sureNot worth it
More about CialisSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Cialis (Tadalafil)?
Worth itNot sureNot worth it